Music therapy has a long history dating back to ancient times. It grew as a recognized field after World War II when musicians began visiting veterans' hospitals. Formal training programs were established in the 1940s and various organizations were formed to promote music therapy. It developed further in the 1950s-1970s with more programs and research. Music therapy can be used to address physical, cognitive, social, and emotional goals and is practiced with a variety of populations in multiple settings. Therapists employ different techniques including singing, playing instruments, improvisation, and rhythmic entrainment to facilitate changes in clients. [END SUMMARY]